Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 184, Issue 9, Pages 2543-2552Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2011.07.012
Keywords
Solubility; Heat of solution; Precipitates; Diffusion couple; Orientation relationship; Thermoelectrics
Funding
- PRESTO (PRESTO: Precursory Research for Embryonic Science and Technology) Japan Science and Technology Agency
- NSF at Caltech
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The solvus lines of the PbTe and Ag2Te phases in the pseudo-binary PbTe-Ag2Te system have been determined using diffusion couples and unidirectional solidification by the Bridgman method. The solubilities of both Ag2Te in PbTe and PbTe in Ag2Te decrease with decrease in temperature. For the former, this change is from 14.9 at% Ag (694 degrees C) to 0.5 at% Ag (375 degrees C), while for the latter it is from 12.4 at% Pb (650 degrees C) to 3.1 at% Pb (375 degrees C). The decrease in solubilities leads to the formation of precipitates of Ag2Te in PbTe and PbTe in AB(2)Te. In particular, fast atomic diffusion in Ag2Te results in the precipitation of PbTe even in quenched samples. From the temperature dependence of these solubilities, heats of solution have been determined. In the diffusion couple, the phase boundary moves toward PbTe. In the region between the phase boundary and the initial interface, PbTe transforms to beta-Ag2Te (cubic) retaining the cube-on-cube orientation relationship. (C) 2011 Elsevier Inc. All rights reserved.
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